| 摘要 |
In controlling a vacuum modulating valve for EGR control, incorporating therein a temperature detecting element, a required drive signal of the vacuum modulating valve, which is obtained in accordance with operating conditions of an engine including an engine speed and an engine load is two-dimensionally corrected in accordance with at least a temperature of the vacuum modulating valve, which is detected by the temperature detecting element, and a driving level of the required drive signal, so that temperature compensation with high accuracy is performed with no use of a current feedback circuit.
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